So basically, they stay in The Nothingness World until I decide to make them cannon. Flame is an acceptation since I take a liking to him, and the fact he is the only kid of Lux and Lucas's I've actually given a Cannon Version to, but since idfk what to do with his Cannon Ver since I do not have a full on back story, he's gonna be Semi-Cannon, meaning he can leave The Nothingness World, for a period of time.
And since Sue and Ted are not cannon, they cannot interact with the cannon world, same with Selever and Ras. Even with all of their power combined, they cannot create a portal to the cannon universe. Sue knows that if they succeed, they will kill time itself, causing an implosion on the world, killing everyone and everything, even the things that are not living, causing time to restart.
However, if Lucas does decide to show or say his love towards Lux fully, then perhaps I'll try to do something with them.
But for now, they're in the Nothingness World with them.